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95/04642 Natural gas in the world: 1994 survey

Publisher
Elsevier Science
Year
1995
Weight
190 KB
Volume
36
Category
Article
ISSN
0140-6701

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## 287 those of a tuning fork. The ears in some way perceive a difference between sound wave and another of the same pitch which is ahead or behind the first in its cycle of motion. This ability to notice phase difference ceases when the frequency of the sound is from ~2oo to I5oo double vibration